US7420746B2 - Zoom lens system and image pickup apparatus having the same - Google Patents
Zoom lens system and image pickup apparatus having the same Download PDFInfo
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- US7420746B2 US7420746B2 US11/943,336 US94333607A US7420746B2 US 7420746 B2 US7420746 B2 US 7420746B2 US 94333607 A US94333607 A US 94333607A US 7420746 B2 US7420746 B2 US 7420746B2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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- the present invention relates to a zoom lens system.
- the market has desired a zoom lens for use in a photographic optical system of an image pickup apparatus having a high zoom ratio and a high optical performance in the entire zoom range.
- a four-unit zoom lens which includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power, in order from an object side to an image side.
- a so-called rear focus type four-unit zoom lens that moves a second lens unit to vary magnification and moves a fourth lens unit to compensate for movement of an image plane caused by the variation of magnification and to perform focusing (see Japanese Patent Application Laid-Open No. 08-304700, Japanese Patent Application Laid-Open No. 2000-121941, and Japanese Patent Application Laid-Open No. 2003-295053, which corresponds to U.S. Pat. No. 6,751,029).
- a rear focus type four-unit zoom lens performs focusing by moving a lens unit that is relatively small-sized and relatively light in weight. Accordingly, such a rear focus type four-unit zoom lens requires only a small drive force for driving the lens unit. This enables a quick and rapid focusing.
- Japanese Patent Application Laid-Open No. 05-060971 which corresponds to U.S. Pat. No. 5,638,216
- Japanese Patent Application Laid-Open No. 2005-242014 which corresponds to U.S. Pat. No. 6,972,909
- the second lens unit includes a lens having a negative refractive power in which an absolute value of a refractive power of a surface on the object side is larger than that on the image side, and a cemented lens including a bi-concave lens having a negative refractive and a lens having a positive refractive power, in order from the object side to the image side.
- the second lens unit includes three single lenses and does not include a cemented lens, thus achieving a high optical performance in the entire zoom range.
- a positive lens included in the second lens is made of a material having an Abbe number smaller than “20” and a refractive index higher than “1.9”. Accordingly, the refractive power of the second lens unit can be intensified to a level at which the zoom ratio as high as “20” can be secured. Accordingly, a high optical performance can be achieved in the entire zoom range.
- the rear principal point position can be brought closer to the object side or to bring the front principal point position closer to the image side.
- the present invention is directed to a zoom lens that can be used in an image pickup apparatus (e.g., a video camera, a silver-halide camera, a digital still camera, and other image pickup apparatus as known by one of ordinary skill in the relevant arts).
- an image pickup apparatus e.g., a video camera, a silver-halide camera, a digital still camera, and other image pickup apparatus as known by one of ordinary skill in the relevant arts.
- the present invention is also directed to a zoom lens system that can achieve a high optical performance in the entire zoom range while achieving a high zoom ratio.
- a zoom lens system includes, in order from an object side to an image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power.
- the second lens unit and the fourth lens unit move during zooming.
- the first lens unit consists of, in order from the object side to the image side, a first lens element having a negative optical power, a second lens element having a positive optical power, and a third lens element having a positive optical power.
- the second lens unit consists of, in order from the object side to the image side, a fourth lens element having a negative optical power, a fifth lens element having a negative optical power, and a sixth lens element having a positive optical power.
- a focal length of the second lens element (f 12 ), a focal length of the third lens element (f 13 ), a radius of curvature of a surface on the object side of the third lens element (R 13 a ), and a radius of curvature of a surface on the image side of the third lens element (R 13 b ) satisfy the following conditions: 0.36 ⁇ f 12/ f 13 ⁇ 0.51, and 3.9 ⁇ ( R 13 b+R 13 a )/( R 13 b ⁇ R 13 a ) ⁇ 6.0.
- FIG. 1 is a cross section of a zoom lens system according to a first exemplary embodiment of the present invention.
- FIG. 2 is a chart illustrating various aberrations occurring in the zoom lens system at a wide-angle end according to the first exemplary embodiment of the present invention.
- FIG. 3 is a chart illustrating various aberrations occurring in the zoom lens system at a middle focal length position according to the first exemplary embodiment of the present invention.
- FIG. 4 is a chart illustrating various aberrations occurring in the zoom lens system at a telephoto end according to the first exemplary embodiment of the present invention.
- FIG. 5 is a cross section of a zoom lens system according to a second exemplary embodiment of the present invention.
- FIG. 6 is a chart illustrating various aberrations occurring in the zoom lens system at a wide-angle end according to the second exemplary embodiment of the present invention.
- FIG. 7 is a chart illustrating various aberrations occurring in the zoom lens system at a middle focal length position according to the second exemplary embodiment of the present invention.
- FIG. 8 is a chart illustrating various aberrations occurring in the zoom lens system at a telephoto end according to the second exemplary embodiment of the present invention.
- FIG. 9 is a cross section of a zoom lens system according to a third exemplary embodiment of the present invention.
- FIG. 10 is a chart illustrating various aberrations occurring in the zoom lens system at a wide-angle end according to the third exemplary embodiment of the present invention.
- FIG. 11 is a chart illustrating various aberrations occurring in the zoom lens system at a middle focal length position according to the third exemplary embodiment of the present invention.
- FIG. 12 is a chart illustrating various aberrations occurring in the zoom lens system at a telephoto end according to the third exemplary embodiment of the present invention.
- FIG. 13 is a diagram illustrating components of an image pickup apparatus (video camera) according to an exemplary embodiment of the present invention.
- any specific values for example the zoom ratio and F-number, should be interpreted to be illustrative only and non limiting. Thus, other examples of the exemplary embodiments could have different values.
- FIG. 1 is a diagram illustrating a cross section of a zoom lens system at the wide-angle end (a short focal length end) according to a first exemplary embodiment of the present invention.
- FIG. 2 , FIG. 3 , and FIG. 4 respectively illustrate an aberration chart at the wide-angle end, at a middle focal length position, and at the telephoto end (a long focal length end) of the zoom lens system according to the first exemplary embodiment.
- FIG. 5 is a diagram illustrating a cross section of the zoom lens system at the wide-angle end according to a second exemplary embodiment of the present invention.
- FIG. 6 , FIG. 7 , and FIG. 8 respectively illustrate an aberration chart at the wide-angle end, at a middle focal length position, and at a telephoto end of the zoom lens system according to the second exemplary embodiment.
- FIG. 9 is a diagram illustrating a cross section of the zoom lens system at the wide-angle end according to a third exemplary embodiment of the present invention.
- FIG. 10 , FIG. 11 , and FIG. 12 respectively illustrate an aberration chart at the wide-angle end, at a middle focal length position, and at a telephoto end of the zoom lens system according to the third exemplary embodiment of the present invention.
- FIG. 13 is a diagram illustrating components of a video camera (image pickup apparatus) having a zoom lens system according to an exemplary embodiment of the present invention.
- the zoom lens system according to each of the exemplary embodiments is a photographic lens system, which can be used with an image pickup apparatus such as a video camera, a digital still camera, and a silver-halide film camera.
- an object side front side
- an image side back side
- FIGS. 1 , 5 , and 9 an object side (front side) is shown at the left-hand portion
- an image side back side
- FIGS. 1 , 5 , and 9 an original image side (back side) is shown at the right-hand portion.
- the zoom lens system can further include an aperture stop SP.
- the aperture stop Sp is disposed at the object side of the third lens unit L 3 a - c.
- G denotes an optical block that is equivalent to an optical filter, a face plate, a crystal low-pass filter, and an infrared-ray cut filter, or other type of optical filter as known by one of ordinary skill in the relevant arts.
- IP denotes an image plane.
- the image plane IP is, when the zoom lens system according to an exemplary embodiment is used as a photographic optical system of a video camera or a digital still camera, equivalent to an imaging plane of a solid-state image sensor, such as a charge-coupled device (CCD) sensor or a complementary metal-oxide semiconductor (CMOS) sensor.
- CCD charge-coupled device
- CMOS complementary metal-oxide semiconductor
- the image plane IP is, when the zoom lens is used as a photographic optical system of a silver-halide film camera, equivalent to a film surface.
- d and g respectively denote d-line and g-line light.
- ⁇ M and ⁇ S respectively denote a meridional image plane and a sagittal image plane.
- Chromatic aberration of magnification is represented with g-line light.
- ⁇ denotes a half angle of view
- Fno denotes an F-number.
- the Y-axis in the spherical aberration's graph is entrance pupil radius
- the Y-axis in the astigmatism's, distortion's and chromatic aberration of magnification's graphs is image height.
- the wide-angle end and the telephoto end are zooming positions at which a lens unit for varying magnification (the second lens unit L 2 a - c ) is positioned at respective ends of a mechanically movable range thereof on an optical axis.
- the second lens unit L 2 a - c moves towards the image side with a locus indicated by an arrow A 1 - 3 to vary magnification during zooming from the wide-angle end to the telephoto end.
- the fourth lens unit L 4 a - c moves with a locus convex towards the object side to compensate for movement of an image plane caused by the variation of magnification.
- the zoom lens system is a rear focus type four-unit zoom lens in which the fourth lens unit L 4 a - c moves along the optical axis during focusing.
- a full line curve B 1 a - 3 a and a dotted curve B 1 b - 3 b for the fourth lens unit L 4 a - c denote a locus of movement for compensating for movement of an image plane caused by the variation of magnification during focusing on an infinitely distant object and a closest object, respectively.
- the fourth lens unit L 4 a - c moves with a locus convex towards the object side, thus effectively utilizing a space between the third lens unit L 3 a - c and the fourth lens unit L 4 a - c .
- an exemplary embodiment of the present invention can effectively reduce the length of the entire zoom lens system.
- the fourth lens unit L 4 a moves forward as indicated by an arrow B 1 c - 3 c.
- the first lens unit L 1 a - c , the third lens unit L 3 a - c , and the aperture stop SP do not move along the optical axis during zooming and during focusing.
- the first lens unit L 1 a - c , the third lens unit L 3 a - c , and the aperture stop SP can move along the optical axis to correct aberration.
- the first lens unit L 1 a - c includes three lens elements, namely, in order from the object side to the image side, a first meniscus lens element G 11 a - c having a negative refractive power and having a convex surface facing the object side, a second lens element G 12 a - c having a positive refractive power, and a third meniscus lens element G 13 a - c having a positive refractive power and having a convex surface facing the object side.
- the first lens element G 11 a - c and the second lens element G 12 a - c are cemented together to form a cemented lens.
- the focal length and the lens shape of the second lens element G 12 a - c and the third lens element G 13 a - c are appropriately set to achieve a high zoom ratio while maintaining a high optical performance.
- the lens configuration of the second lens unit L 2 a - c has a significant influence on the variation of aberration occurring during zooming.
- the second lens unit L 2 a - c includes, in order from the object side to the image side, a fourth lens element G 21 a - c having a negative refractive power in which an absolute value of a refractive power of a surface on the image side is larger than that on the object side, a fifth lens element G 22 a - c having a negative refractive power and having a concave surface facing the object side, and a sixth lens element G 23 a - c having a positive refractive power in which an absolute value of a refractive power of a surface on the object side is larger than that on the image side.
- the surface of the fifth lens element G 22 a - c on the image side and the surface of the sixth lens element G 23 a - c on the object side are located away from each other on the optical axis, thus providing a space of air between the fifth lens element G 22 a - c and the sixth lens element G 23 a - c .
- an exemplary embodiment of the present invention can reduce or suppress aberration variation or distortion variation during zooming.
- the third lens unit L 3 a - c includes, in order from the object side to the image side, a seventh biconvex lens element G 31 a - c having a positive refractive power and an eighth meniscus lens element G 32 a - c having a negative refractive power and having a convex surface facing the object side.
- an exemplary embodiment of the present invention can correct spherical aberration and axial chromatic aberration at the wide-angle end and can further reduce curvature of field in the entire zoom range from the wide-angle end to the telephoto end.
- the fourth lens unit L 4 a - c includes, in order from the object side to the image side, a ninth biconvex lens element G 41 a - c having a positive refractive power and a tenth meniscus lens element G 42 a - c having a negative refractive power and having a convex surface facing the image side.
- an exemplary embodiment of the present invention can appropriately correct spherical aberration and axial chromatic aberration at the wide-angle end and can further reduce or suppress variation of chromatic aberration of magnification in the entire zoom range.
- an exemplary embodiment of the present invention can reduce or suppress aberration variation occurring during focusing with the fourth lens unit L 4 a - c.
- a zoom lens system includes, in order from the object side to the image side, a first lens unit L 1 a - c having a positive refractive power, a second lens unit L 2 a - c having a negative refractive power, a third lens unit L 3 a - c having a positive refractive power, and a fourth lens unit L 4 a - c having a positive refractive power.
- the second lens unit L 2 a - c and the fourth lens unit L 4 a - c move during zooming.
- the first lens unit L 1 a - c includes, in order from the object side to the image side, a first lens element G 11 a - c having a negative refractive power, a second lens element G 12 a - c having a positive refractive power, and a third lens element G 13 a - c having a positive refractive power.
- the second lens unit L 2 a - c includes, in order from the object side to the image side, the fourth lens element G 21 a - c having a negative refractive power, the fifth lens element G 22 a - c having a negative refractive power, and the sixth lens element G 23 a - c having a positive refractive power.
- an absolute value of a refractive power of a surface on the image side is larger than that on the object side.
- the fifth lens element G 22 a - c of the second lens unit L 2 a - c has a concave surface facing the object side.
- an absolute value of a refractive power of a surface on the object side is larger than that on the image side.
- the surface on the image side of the fifth lens element G 22 a - c and the surface on the object side of the sixth lens element G 23 a - c are located away from each other on the optical axis across a space of air. That is, the fifth lens element G 22 a - c and the sixth lens element G 23 a - c do not form a cemented lens.
- the focal length for each of the second lens element G 12 a - c and the third lens element G 13 a - c is calculated supposing that the second lens element G 12 a - c and the third lens element G 13 a - c are separated from each other and placed in a medium having a refractive index of 1 (e.g., air) if they are constituent elements of a cemented lens.
- a medium having a refractive index of 1 e.g., air
- the zoom lens system can achieve a high zoom ratio. If the upper limit value of the conditional expression (1) is exceeded, the positive refractive power of the third lens element G 13 a - c becomes too large, which may cause the rear principal point position of the first lens unit L 1 a - c to move towards the image side.
- the distance between the first lens unit L 1 a - c and the second lens unit L 2 a - c becomes too short, which causes the focal length of the zoom lens system at the telephoto end to be short.
- the positive refractive power of a surface of the third lens element G 13 a - c on the object side and the negative refractive power of a surface of the third lens element G 13 a - c on the image side become too large. In this case, it is difficult to correct high-order aberrations.
- the lower limit value of the conditional expression (2) is exceeded, the negative refractive power of a surface of the third lens element G 13 a - c on the image side becomes too small. In this case, the rear principal point position of the first lens unit L 1 a - c may move towards the image side. Accordingly, it is difficult to achieve a high zoom ratio.
- the zoom lens system according to an exemplary embodiment of the present invention can satisfy the following conditional expressions.
- the focal lengths of the fourth lens element G 21 a - c and the fifth lens element G 22 a - c (f 21 , f 22 ), a radius of curvature of a surface on the image side of the fifth lens element G 22 a - c (R 22 b ), and a radius of curvature of a surface on the object side of the sixth lens element G 23 a - c (R 23 a ) can satisfy the following conditionals: 0.43 ⁇ f 21/ f 22 ⁇ 0.79 (3) 0.95 ⁇ R 22 b/R 23 a ⁇ 2.75 (4).
- conditional expression (3) If the upper limit value of the conditional expression (3) is exceeded, it is difficult to correct astigmatism at the wide-angle end. On the other hand, if the lower limit value of the conditional expression (3) is exceeded, it is difficult to correct distortion at the wide-angle end.
- conditional expression (3) provides a condition for a useful arrangement of the refractive powers of the fourth lens element G 21 a - c and the fifth lens element G 22 a - c .
- conditional expression (4) provides a condition for sufficiently correcting variation of curvature of field occurring during zooming, by securing a sufficient ratio between the radii of curvature R 22 b and R 23 a for each lens surface.
- a refractive index (N 23 ) and an Abbe number ( ⁇ 23 ) of a material of the sixth lens element G 23 a - c can satisfy the following conditions: ⁇ 23 ⁇ 20 (5) N23>1.9 (6).
- the conditional expression (5) provides a condition for effectively correcting chromatic aberration in the case where one positive lens is used in the three lens elements constituting the second lens unit L 2 a - c . If the upper limit value of the conditional expression (5) is exceeded, a sufficient effect of achromatism cannot be obtained in the second lens unit L 2 a - c . Thus, in this case, a large chromatic aberration variation may occur during zooming.
- conditional expression (6) provides a condition for effectively correcting aberration variation in the case where one positive lens is used in the three lens elements constituting the second lens unit L 2 a - c . If the lower limit value of the conditional expression (6) is exceeded, it becomes difficult to sufficiently correct a variation of coma occurring during zooming.
- An imaging magnification of the second lens unit L 2 a - c at the wide-angle end ( ⁇ 2w) and an imaging magnification of the second lens unit L 2 a - c at the telephoto end ( ⁇ 2t) can satisfy the following condition: 39.0 ⁇ 2 t/ ⁇ 2 w ⁇ 84.7 (7).
- conditional expression (7) provides a condition for a tolerable range of variation of the imaging magnification of the second lens unit L 2 a - c during zooming.
- conditional expression (7) If the upper limit value of the conditional expression (7) is exceeded, it becomes difficult to correct aberration in the entire zoom range, although it is useful in achieving a high zoom ratio. On the other hand, if the lower limit value of the conditional expression (7) is exceeded, it becomes difficult to secure a desired zoom ratio.
- the range of the values in the conditional expressions (1) through (7) can be altered as follows: 0.38 ⁇ f 12/ f 13 ⁇ 0.49 (1a) 4.1 ⁇ ( R 13 b+R 13 a )/( R 13 b ⁇ R 13 a ) ⁇ 5.7 (2a) 0.45 ⁇ f 21/ f 22 ⁇ 0.75 (3a) 1.00 ⁇ R 22 b/R 23 a ⁇ 2.60 (4a) ⁇ 23 ⁇ 19 (5a) N23>1.91 (6a) 42.0 ⁇ 2 t/ ⁇ 2 w ⁇ 80.0 (7a).
- a lens unit such as a converter lens or a close-up lens can be arranged on the object side of the first lens unit L 1 a - c or the image side of the fourth lens unit L 4 a - c.
- Numerical examples 1 through 3 that respectively correspond to the first through the third exemplary embodiments are set forth below.
- “i” denotes the order of a surface from the object side
- “Ri” denotes a radius of curvature of the i-th optical surface (an i-th surface)
- “Di” denotes an axial interval between the i-th surface and the (i+1)th surface
- “Ni” and “ ⁇ i” respectively denote a refractive index and an Abbe number of the i-th optical material with respect to d-line light.
- “f” denotes the focal length
- “Fno” denotes the F-number
- “ ⁇ ” denotes the half angle of view.
- two surfaces closest to the image side are surfaces that constitute an optical block G.
- X denotes a displacement from a surface vertex along the optical axis in a position at a height “h” from the optical axis
- R denotes a paraxial radius of curvature
- k denotes a conic constant
- each of “A′”, “B′”, “C′”, and “D′” denotes an aspheric coefficient.
- the aspheric shape is expressed as follows:
- a zoom lens system having a zoom ratio of about 25 to about 40 and having a high optical performance in the entire zoom range can be implemented.
- the video camera includes a video camera body 10 and a photographic optical system 11 .
- the photographic optical system 11 includes a zoom lens according to an exemplary embodiment of the present invention.
- the video camera body 10 includes an image sensor (solid-state image sensor) 12 , such as a charge-coupled device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor, configured to receive light forming an object image via the photographic optical system 11 .
- an image sensor solid-state image sensor
- CCD charge-coupled device
- CMOS complementary metal oxide semiconductor
- the video camera body 10 further includes a recording unit 13 configured to record information corresponding to an object image photoelectrically converted by the image sensor 12 .
- the video camera body 10 further includes a viewfinder 14 configured to allow a user to observe an object image displayed on a display element (not illustrated).
- the viewfinder 14 includes a liquid crystal display panel (not illustrated) for displaying an object image formed on the image sensor 12 .
- a zoom lens system according to an exemplary embodiment of the present invention applied to an image pickup apparatus, such as a video camera, a small-size image pickup apparatus having a high optical performance can be implemented.
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Abstract
Description
0.36<f12/f13<0.51, and
3.9<(R13b+R13a)/(R13b−R13a)<6.0.
0.36<f12/f13<0.51 (1)
3.9<(R13b+R13a)/(R13b−R13a)<6.0 (2).
0.43<f21/f22<0.79 (3)
0.95<R22b/R23a<2.75 (4).
ν23<20 (5)
N23>1.9 (6).
39.0<β2t/β2w<84.7 (7).
0.38<f12/f13<0.49 (1a)
4.1<(R13b+R13a)/(R13b−R13a)<5.7 (2a)
0.45<f21/f22<0.75 (3a)
1.00<R22b/R23a<2.60 (4a)
ν23<19 (5a)
N23>1.91 (6a)
42.0<β2t/β2w<80.0 (7a).
Numerical Example 1 |
f = 2.66-91.98 Fno = 2.06-5.25 2ω = 57.8°-1.8° |
R1 = 37.258 | D1 = 1.05 | N1 = 1.805181 | ν1 = 25.4 |
R2 = 18.480 | D2 = 4.21 | N2 = 1.696797 | ν2 = 55.5 |
R3 = −651.893 | D3 = 0.25 | ||
R4 = 18.345 | D4 = 1.80 | N3 = 1.696797 | ν3 = 55.5 |
R5 = 29.550 | D5 = Variable | ||
R6 = 27.500 | D6 = 0.60 | N4 = 1.834807 | ν4 = 42.7 |
R7 = 4.076 | D7 = 1.72 | ||
R8 = −45.434 | D8 = 0.60 | N5 = 1.804000 | ν5 = 46.6 |
R9 = 7.660 | D9 = 0.75 | ||
R10 = 7.275 | D10 = 1.29 | N6 = 1.922860 | ν6 = 18.9 |
R11 = 17.489 | D11 = Variable | ||
R12 = Stop | D12 = 1.10 | ||
R13 = 9.929 | D13 = 2.75 | N7 = 1.583126 | ν7 = 59.4 |
R14 = −21.867 | D14 = 0.65 | ||
R15 = 12.114 | D15 = 0.60 | N8 = 1.846660 | ν8 = 23.9 |
R16 = 7.614 | D16 = Variable | ||
R17 = 13.393 | D17 = 2.90 | N9 = 1.518229 | ν9 = 58.9 |
R18 = −5.225 | D18 = 0.60 | N10 = 1.846660 | ν10 = 23.9 |
R19 = −8.241 | D19 = Variable | ||
R20 = ∞ | D20 = 2.13 | N11 = 1.516330 | ν11 = 64.1 |
R21 = ∞ | |||
Focal Length |
Variable Interval | 2.66 | 15.08 | 91.98 | ||
D5 | 0.65 | 15.94 | 22.49 | ||
D11 | 23.14 | 7.85 | 1.30 | ||
D16 | 7.68 | 3.62 | 11.45 | ||
D19 | 5.97 | 10.04 | 2.21 | ||
Aspheric Coefficients |
R13: | k = −1.18213e+00 | A′ = 0.00000e+00 | B′ = 2.41938e−06, |
C′ = −4.67393e−07 | D′ = −1.84465e−08 | ||
R14: | k = −1.33778e+01 | A′ = 0.00000e+00 | B′ = −1.79477e−06 |
C′ = 0.00000e+00 | D′ = 0.00000e+00 | ||
Numerical Example 2 |
f = 2.35-92.79 Fno = 2.06-4.50 2ω = 64.0°-1.8° |
R1 = 36.609 | D1 = 1.10 | N1 = 1.846660 | ν1 = 23.9 |
R2 = 19.994 | D2 = 5.32 | N2 = 1.696797 | ν2 = 55.5 |
R3 = −517.036 | D3 = 0.20 | ||
R4 = 19.228 | D4 = 1.95 | N3 = 1.712995 | ν3 = 53.9 |
R5 = 30.836 | D5 = Variable | ||
R6 = 32.447 | D6 = 0.60 | N4 = 1.882997 | ν4 = 40.8 |
R7 = 4.188 | D7 = 2.04 | ||
R8 = −29.415 | D8 = 0.60 | N5 = 1.712995 | ν5 = 53.9 |
R9 = 8.471 | D9 = 0.74 | ||
R10 = 7.381 | D10 = 1.30 | N6 = 1.922860 | ν6 = 18.9 |
R11 = 14.649 | D11 = Variable | ||
R12 = Stop | D12 = 1.10 | ||
R13 = 10.789 | D13 = 2.55 | N7 = 1.583126 | ν7 = 59.4 |
R14 = −31.463 | D14 = 0.54 | ||
R15 = 9.849 | D15 = 0.60 | N8 = 1.846660 | ν8 = 23.9 |
R16 = 7.483 | D16 = Variable | ||
R17 = 13.608 | D17 = 2.74 | N9 = 1.563839 | ν9 = 60.7 |
R18 = −4.836 | D18 = 0.70 | N10 = 1.846660 | ν10 = 23.9 |
R19 = −8.380 | D19 = Variable | ||
R20 = ∞ | D20 = 2.13 | N11 = 1.516330 | ν11 = 64.1 |
R21 = ∞ | |||
Focal Length |
Variable Interval | 2.35 | 14.91 | 92.79 | ||
D5 | 0.65 | 16.49 | 22.65 | ||
D11 | 23.10 | 7.26 | 1.10 | ||
D16 | 7.31 | 3.50 | 10.80 | ||
D19 | 5.69 | 9.49 | 2.19 | ||
Aspheric Coefficients |
R13: | k = −9.91076e−01 | A′ = 0.00000e+00 | B′ = −2.11851e−05 |
C′ = 2.76243e−06 | D′ = −2.40692e−07 | ||
R14: | k = −2.34787e+01 | A′ = 0.00000e+00 | B′ = −5.33175e−06 |
C′ = 1.54483e−06 | D′ = −2.45265e−07 | ||
Numerical Example 3 |
f = 2.66-65.63 Fno = 1.85-4.37 2ω = 57.9°-2.6° |
R1 = 25.805 | D1 = 0.95 | N1 = 1.922860 | ν1 = 18.9 |
R2 = 16.574 | D2 = 3.41 | N2 = 1.696797 | ν2 = 55.5 |
R3 = −12275.062 | D3 = 0.20 | ||
R4 = 15.199 | D4 = 1.35 | N3 = 1.882997 | ν3 = 40.8 |
R5 = 21.967 | D5 = Variable | ||
R6 = 20.561 | D6 = 0.55 | N4 = 1.882997 | ν4 = 40.8 |
R7 = 3.432 | D7 = 1.89 | ||
R8 = −11.259 | D8 = 0.50 | N5 = 1.712995 | ν5 = 53.9 |
R9 = 19.044 | D9 = 0.50 | ||
R10 = 7.621 | D10 = 1.29 | N6 = 1.922860 | ν6 = 18.9 |
R11 = 15.575 | D11 = Variable | ||
R12 = Stop | D12 = 1.10 | ||
R13 = 9.622 | D13 = 2.53 | N7 = 1.583126 | ν7 = 59.4 |
R14 = −24.658 | D14 = 0.49 | ||
R15 = 8.822 | D15 = 0.60 | N8 = 1.846660 | ν8 = 23.9 |
R16 = 6.574 | D16 = Variable | ||
R17 = 15.045 | D17 = 2.68 | N9 = 1.696797 | ν9 = 55.5 |
R18 = −5.495 | D18 = 0.50 | N10 = 1.846660 | ν10 = 23.9 |
R19 = −12.002 | D19 = Variable | ||
R20 = ∞ | D20 = 2.13 | N11 = 1.516330 | ν11 = 64.1 |
R21 = ∞ | |||
Focal Length |
Variable Interval | 2.66 | 13.82 | 65.63 | ||
D5 | 0.60 | 11.66 | 16.40 | ||
D11 | 16.90 | 5.84 | 1.10 | ||
D16 | 6.20 | 3.10 | 9.39 | ||
D19 | 5.40 | 8.50 | 2.21 | ||
Aspheric Coefficients |
R13: | k = −8.60045e−01 | A′ = 0.00000e+00 | B′ = −7.27199e−06 |
C′ = 1.79924e−06 | D′ = −3.91808e−08 | ||
R14: | k = −2.10746e+01 | A′ = 0.00000e+00 | B′ = 1.56572e−05 |
C′ = 8.27373e−07 | D′ = −1.75531e−08 | ||
TABLE 1 | ||
Numerical Example |
Condition | 1 | 2 | 3 | ||
(1) | 0.397 | 0.414 | 0.465 | ||
(2) | 4.27 | 4.31 | 5.49 | ||
(3) | 0.715 | 0.600 | 0.481 | ||
(4) | 1.05 | 1.15 | 2.50 | ||
(5) | 18.9 | 18.9 | 18.9 | ||
(6) | 1.922860 | 1.922860 | 1.922860 | ||
(7) | 59.9 | 77.0 | 43.3 | ||
Claims (5)
0.36<f12/f13<0.51, and
3.9<(R13b+R13a)/(R13b−R13a)<6.0.
0.43<f21/f22<0.79, and
0.95<R22b/R23a<2.75.
ν23<20, and
N23>1.9.
39.0<β2t/β2w<84.7.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20050007480A1 (en) * | 2003-07-01 | 2005-01-13 | Hiroyuki Hamano | Zoom lens system and image-taking apparatus |
US9958654B2 (en) | 2015-09-24 | 2018-05-01 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
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JP5419519B2 (en) * | 2009-03-31 | 2014-02-19 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
JP5665637B2 (en) * | 2011-04-19 | 2015-02-04 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
KR101776704B1 (en) * | 2012-08-03 | 2017-09-08 | 한화테크윈 주식회사 | Zoom lens system and photographing apparatus with the same |
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JPH0560971A (en) | 1991-08-30 | 1993-03-12 | Canon Inc | Rear focus zoom lens |
JPH08304700A (en) | 1995-04-28 | 1996-11-22 | Canon Inc | Zoom lens of rear focusing system |
US5638216A (en) | 1991-08-30 | 1997-06-10 | Canon Kabushiki Kaisha | Zoom lens |
JP2000121941A (en) | 1998-10-20 | 2000-04-28 | Canon Inc | Zoom lens |
US6577450B2 (en) * | 2000-09-29 | 2003-06-10 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus using the same |
JP2003295053A (en) | 2002-03-29 | 2003-10-15 | Canon Inc | Zoom lens and optical apparatus having the same |
JP2005242014A (en) | 2004-02-26 | 2005-09-08 | Canon Inc | Zoom lens and photographic device using the same |
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JPH06194572A (en) * | 1992-12-24 | 1994-07-15 | Minolta Camera Co Ltd | Variable power lens |
JP4839740B2 (en) * | 2004-09-15 | 2011-12-21 | 株式会社ニコン | Zoom lens |
-
2006
- 2006-12-22 JP JP2006345588A patent/JP4944594B2/en not_active Expired - Fee Related
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2007
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH0560971A (en) | 1991-08-30 | 1993-03-12 | Canon Inc | Rear focus zoom lens |
US5638216A (en) | 1991-08-30 | 1997-06-10 | Canon Kabushiki Kaisha | Zoom lens |
JPH08304700A (en) | 1995-04-28 | 1996-11-22 | Canon Inc | Zoom lens of rear focusing system |
JP2000121941A (en) | 1998-10-20 | 2000-04-28 | Canon Inc | Zoom lens |
US6577450B2 (en) * | 2000-09-29 | 2003-06-10 | Canon Kabushiki Kaisha | Zoom lens and optical apparatus using the same |
JP2003295053A (en) | 2002-03-29 | 2003-10-15 | Canon Inc | Zoom lens and optical apparatus having the same |
US6751029B2 (en) | 2002-03-29 | 2004-06-15 | Canon Kabushiki Kaisha | Zoom lens image pickup apparatus |
JP2005242014A (en) | 2004-02-26 | 2005-09-08 | Canon Inc | Zoom lens and photographic device using the same |
US6972909B2 (en) | 2004-02-26 | 2005-12-06 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus having the same |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050007480A1 (en) * | 2003-07-01 | 2005-01-13 | Hiroyuki Hamano | Zoom lens system and image-taking apparatus |
US7457046B2 (en) * | 2003-07-01 | 2008-11-25 | Canon Kabushiki Kaisha | Zoom lens system and image-taking apparatus |
US9958654B2 (en) | 2015-09-24 | 2018-05-01 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
Also Published As
Publication number | Publication date |
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JP4944594B2 (en) | 2012-06-06 |
JP2008158160A (en) | 2008-07-10 |
US20080151383A1 (en) | 2008-06-26 |
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